target/s390x/cpu.c

   1 /*
   2  * QEMU S/390 CPU
   3  *
   4  * Copyright (c) 2009 Ulrich Hecht
   5  * Copyright (c) 2011 Alexander Graf
   6  * Copyright (c) 2012 SUSE LINUX Products GmbH
   7  * Copyright (c) 2012 IBM Corp.
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  21  */
  22
  23 #include "qemu/osdep.h"
  24 #include "qapi/error.h"
  25 #include "cpu.h"
  26 #include "internal.h"
  27 #include "kvm_s390x.h"
  28 #include "sysemu/kvm.h"
  29 #include "sysemu/reset.h"
  30 #include "qemu/timer.h"
  31 #include "qemu/error-report.h"
  32 #include "qemu/module.h"
  33 #include "trace.h"
  34 #include "qapi/visitor.h"
  35 #include "qapi/qapi-types-machine.h"
  36 #include "qapi/qapi-visit-run-state.h"
  37 #include "sysemu/hw_accel.h"
  38 #include "hw/qdev-properties.h"
  39 #ifndef CONFIG_USER_ONLY
  40 #include "hw/s390x/pv.h"
  41 #include "hw/boards.h"
  42 #include "sysemu/arch_init.h"
  43 #include "sysemu/tcg.h"
  44 #endif
  45 #include "fpu/softfloat-helpers.h"
  46 #include "disas/capstone.h"
  47
  48 #define CR0_RESET       0xE0UL
  49 #define CR14_RESET      0xC2000000UL;
  50
  51 static void s390_cpu_set_pc(CPUState *cs, vaddr value)
  52 {
  53     S390CPU *cpu = S390_CPU(cs);
  54
  55     cpu->env.psw.addr = value;
  56 }
  57
  58 static bool s390_cpu_has_work(CPUState *cs)
  59 {
  60     S390CPU *cpu = S390_CPU(cs);
  61
  62     /* STOPPED cpus can never wake up */
  63     if (s390_cpu_get_state(cpu) != S390_CPU_STATE_LOAD &&
  64         s390_cpu_get_state(cpu) != S390_CPU_STATE_OPERATING) {
  65         return false;
  66     }
  67
  68     if (!(cs->interrupt_request & CPU_INTERRUPT_HARD)) {
  69         return false;
  70     }
  71
  72     return s390_cpu_has_int(cpu);
  73 }
  74
  75 #if !defined(CONFIG_USER_ONLY)
  76 /* S390CPUClass::load_normal() */
  77 static void s390_cpu_load_normal(CPUState *s)
  78 {
  79     S390CPU *cpu = S390_CPU(s);
  80     uint64_t spsw;
  81
  82     if (!s390_is_pv()) {
  83         spsw = ldq_phys(s->as, 0);
  84         cpu->env.psw.mask = spsw & PSW_MASK_SHORT_CTRL;
  85         /*
  86          * Invert short psw indication, so SIE will report a specification
  87          * exception if it was not set.
  88          */
  89         cpu->env.psw.mask ^= PSW_MASK_SHORTPSW;
  90         cpu->env.psw.addr = spsw & PSW_MASK_SHORT_ADDR;
  91     } else {
  92         /*
  93          * Firmware requires us to set the load state before we set
  94          * the cpu to operating on protected guests.
  95          */
  96         s390_cpu_set_state(S390_CPU_STATE_LOAD, cpu);
  97     }
  98     s390_cpu_set_state(S390_CPU_STATE_OPERATING, cpu);
  99 }
 100 #endif
 101
 102 /* S390CPUClass::reset() */
 103 static void s390_cpu_reset(CPUState *s, cpu_reset_type type)
 104 {
 105     S390CPU *cpu = S390_CPU(s);
 106     S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
 107     CPUS390XState *env = &cpu->env;
 108     DeviceState *dev = DEVICE(s);
 109
 110     scc->parent_reset(dev);
 111     cpu->env.sigp_order = 0;
 112     s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu);
 113
 114     switch (type) {
 115     case S390_CPU_RESET_CLEAR:
 116         memset(env, 0, offsetof(CPUS390XState, start_initial_reset_fields));
 117         /* fall through */
 118     case S390_CPU_RESET_INITIAL:
 119         /* initial reset does not clear everything! */
 120         memset(&env->start_initial_reset_fields, 0,
 121                offsetof(CPUS390XState, start_normal_reset_fields) -
 122                offsetof(CPUS390XState, start_initial_reset_fields));
 123
 124         /* architectured initial value for Breaking-Event-Address register */
 125         env->gbea = 1;
 126
 127         /* architectured initial values for CR 0 and 14 */
 128         env->cregs[0] = CR0_RESET;
 129         env->cregs[14] = CR14_RESET;
 130
 131 #if defined(CONFIG_USER_ONLY)
 132         /* user mode should always be allowed to use the full FPU */
 133         env->cregs[0] |= CR0_AFP;
 134         if (s390_has_feat(S390_FEAT_VECTOR)) {
 135             env->cregs[0] |= CR0_VECTOR;
 136         }
 137 #endif
 138
 139         /* tininess for underflow is detected before rounding */
 140         set_float_detect_tininess(float_tininess_before_rounding,
 141                                   &env->fpu_status);
 142        /* fall through */
 143     case S390_CPU_RESET_NORMAL:
 144         env->psw.mask &= ~PSW_MASK_RI;
 145         memset(&env->start_normal_reset_fields, 0,
 146                offsetof(CPUS390XState, end_reset_fields) -
 147                offsetof(CPUS390XState, start_normal_reset_fields));
 148
 149         env->pfault_token = -1UL;
 150         env->bpbc = false;
 151         break;
 152     default:
 153         g_assert_not_reached();
 154     }
 155
 156     /* Reset state inside the kernel that we cannot access yet from QEMU. */
 157     if (kvm_enabled()) {
 158         switch (type) {
 159         case S390_CPU_RESET_CLEAR:
 160             kvm_s390_reset_vcpu_clear(cpu);
 161             break;
 162         case S390_CPU_RESET_INITIAL:
 163             kvm_s390_reset_vcpu_initial(cpu);
 164             break;
 165         case S390_CPU_RESET_NORMAL:
 166             kvm_s390_reset_vcpu_normal(cpu);
 167             break;
 168         }
 169     }
 170 }
 171
 172 #if !defined(CONFIG_USER_ONLY)
 173 static void s390_cpu_machine_reset_cb(void *opaque)
 174 {
 175     S390CPU *cpu = opaque;
 176
 177     run_on_cpu(CPU(cpu), s390_do_cpu_full_reset, RUN_ON_CPU_NULL);
 178 }
 179 #endif
 180
 181 static void s390_cpu_disas_set_info(CPUState *cpu, disassemble_info *info)
 182 {
 183     info->mach = bfd_mach_s390_64;
 184     info->print_insn = print_insn_s390;
 185     info->cap_arch = CS_ARCH_SYSZ;
 186     info->cap_insn_unit = 2;
 187     info->cap_insn_split = 6;
 188 }
 189
 190 static void s390_cpu_realizefn(DeviceState *dev, Error **errp)
 191 {
 192     CPUState *cs = CPU(dev);
 193     S390CPUClass *scc = S390_CPU_GET_CLASS(dev);
 194 #if !defined(CONFIG_USER_ONLY)
 195     S390CPU *cpu = S390_CPU(dev);
 196 #endif
 197     Error *err = NULL;
 198
 199     /* the model has to be realized before qemu_init_vcpu() due to kvm */
 200     s390_realize_cpu_model(cs, &err);
 201     if (err) {
 202         goto out;
 203     }
 204
 205 #if !defined(CONFIG_USER_ONLY)
 206     MachineState *ms = MACHINE(qdev_get_machine());
 207     unsigned int max_cpus = ms->smp.max_cpus;
 208     if (cpu->env.core_id >= max_cpus) {
 209         error_setg(&err, "Unable to add CPU with core-id: %" PRIu32
 210                    ", maximum core-id: %d", cpu->env.core_id,
 211                    max_cpus - 1);
 212         goto out;
 213     }
 214
 215     if (cpu_exists(cpu->env.core_id)) {
 216         error_setg(&err, "Unable to add CPU with core-id: %" PRIu32
 217                    ", it already exists", cpu->env.core_id);
 218         goto out;
 219     }
 220
 221     /* sync cs->cpu_index and env->core_id. The latter is needed for TCG. */
 222     cs->cpu_index = cpu->env.core_id;
 223 #endif
 224
 225     cpu_exec_realizefn(cs, &err);
 226     if (err != NULL) {
 227         goto out;
 228     }
 229
 230 #if !defined(CONFIG_USER_ONLY)
 231     qemu_register_reset(s390_cpu_machine_reset_cb, cpu);
 232 #endif
 233     s390_cpu_gdb_init(cs);
 234     qemu_init_vcpu(cs);
 235
 236     /*
 237      * KVM requires the initial CPU reset ioctl to be executed on the target
 238      * CPU thread. CPU hotplug under single-threaded TCG will not work with
 239      * run_on_cpu(), as run_on_cpu() will not work properly if called while
 240      * the main thread is already running but the CPU hasn't been realized.
 241      */
 242     if (kvm_enabled()) {
 243         run_on_cpu(cs, s390_do_cpu_full_reset, RUN_ON_CPU_NULL);
 244     } else {
 245         cpu_reset(cs);
 246     }
 247
 248     scc->parent_realize(dev, &err);
 249 out:
 250     error_propagate(errp, err);
 251 }
 252
 253 #if !defined(CONFIG_USER_ONLY)
 254 static GuestPanicInformation *s390_cpu_get_crash_info(CPUState *cs)
 255 {
 256     GuestPanicInformation *panic_info;
 257     S390CPU *cpu = S390_CPU(cs);
 258
 259     cpu_synchronize_state(cs);
 260     panic_info = g_malloc0(sizeof(GuestPanicInformation));
 261
 262     panic_info->type = GUEST_PANIC_INFORMATION_TYPE_S390;
 263     panic_info->u.s390.core = cpu->env.core_id;
 264     panic_info->u.s390.psw_mask = cpu->env.psw.mask;
 265     panic_info->u.s390.psw_addr = cpu->env.psw.addr;
 266     panic_info->u.s390.reason = cpu->env.crash_reason;
 267
 268     return panic_info;
 269 }
 270
 271 static void s390_cpu_get_crash_info_qom(Object *obj, Visitor *v,
 272                                         const char *name, void *opaque,
 273                                         Error **errp)
 274 {
 275     CPUState *cs = CPU(obj);
 276     GuestPanicInformation *panic_info;
 277
 278     if (!cs->crash_occurred) {
 279         error_setg(errp, "No crash occurred");
 280         return;
 281     }
 282
 283     panic_info = s390_cpu_get_crash_info(cs);
 284
 285     visit_type_GuestPanicInformation(v, "crash-information", &panic_info,
 286                                      errp);
 287     qapi_free_GuestPanicInformation(panic_info);
 288 }
 289 #endif
 290
 291 static void s390_cpu_initfn(Object *obj)
 292 {
 293     CPUState *cs = CPU(obj);
 294     S390CPU *cpu = S390_CPU(obj);
 295
 296     cpu_set_cpustate_pointers(cpu);
 297     cs->exception_index = EXCP_HLT;
 298 #if !defined(CONFIG_USER_ONLY)
 299     cs->start_powered_off = true;
 300     object_property_add(obj, "crash-information", "GuestPanicInformation",
 301                         s390_cpu_get_crash_info_qom, NULL, NULL, NULL);
 302     cpu->env.tod_timer =
 303         timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_tod_timer, cpu);
 304     cpu->env.cpu_timer =
 305         timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_cpu_timer, cpu);
 306     s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu);
 307 #endif
 308 }
 309
 310 static void s390_cpu_finalize(Object *obj)
 311 {
 312 #if !defined(CONFIG_USER_ONLY)
 313     S390CPU *cpu = S390_CPU(obj);
 314
 315     timer_free(cpu->env.tod_timer);
 316     timer_free(cpu->env.cpu_timer);
 317
 318     qemu_unregister_reset(s390_cpu_machine_reset_cb, cpu);
 319     g_free(cpu->irqstate);
 320 #endif
 321 }
 322
 323 #if !defined(CONFIG_USER_ONLY)
 324 static bool disabled_wait(CPUState *cpu)
 325 {
 326     return cpu->halted && !(S390_CPU(cpu)->env.psw.mask &
 327                             (PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK));
 328 }
 329
 330 static unsigned s390_count_running_cpus(void)
 331 {
 332     CPUState *cpu;
 333     int nr_running = 0;
 334
 335     CPU_FOREACH(cpu) {
 336         uint8_t state = S390_CPU(cpu)->env.cpu_state;
 337         if (state == S390_CPU_STATE_OPERATING ||
 338             state == S390_CPU_STATE_LOAD) {
 339             if (!disabled_wait(cpu)) {
 340                 nr_running++;
 341             }
 342         }
 343     }
 344
 345     return nr_running;
 346 }
 347
 348 unsigned int s390_cpu_halt(S390CPU *cpu)
 349 {
 350     CPUState *cs = CPU(cpu);
 351     trace_cpu_halt(cs->cpu_index);
 352
 353     if (!cs->halted) {
 354         cs->halted = 1;
 355         cs->exception_index = EXCP_HLT;
 356     }
 357
 358     return s390_count_running_cpus();
 359 }
 360
 361 void s390_cpu_unhalt(S390CPU *cpu)
 362 {
 363     CPUState *cs = CPU(cpu);
 364     trace_cpu_unhalt(cs->cpu_index);
 365
 366     if (cs->halted) {
 367         cs->halted = 0;
 368         cs->exception_index = -1;
 369     }
 370 }
 371
 372 unsigned int s390_cpu_set_state(uint8_t cpu_state, S390CPU *cpu)
 373  {
 374     trace_cpu_set_state(CPU(cpu)->cpu_index, cpu_state);
 375
 376     switch (cpu_state) {
 377     case S390_CPU_STATE_STOPPED:
 378     case S390_CPU_STATE_CHECK_STOP:
 379         /* halt the cpu for common infrastructure */
 380         s390_cpu_halt(cpu);
 381         break;
 382     case S390_CPU_STATE_OPERATING:
 383     case S390_CPU_STATE_LOAD:
 384         /*
 385          * Starting a CPU with a PSW WAIT bit set:
 386          * KVM: handles this internally and triggers another WAIT exit.
 387          * TCG: will actually try to continue to run. Don't unhalt, will
 388          *      be done when the CPU actually has work (an interrupt).
 389          */
 390         if (!tcg_enabled() || !(cpu->env.psw.mask & PSW_MASK_WAIT)) {
 391             s390_cpu_unhalt(cpu);
 392         }
 393         break;
 394     default:
 395         error_report("Requested CPU state is not a valid S390 CPU state: %u",
 396                      cpu_state);
 397         exit(1);
 398     }
 399     if (kvm_enabled() && cpu->env.cpu_state != cpu_state) {
 400         kvm_s390_set_cpu_state(cpu, cpu_state);
 401     }
 402     cpu->env.cpu_state = cpu_state;
 403
 404     return s390_count_running_cpus();
 405 }
 406
 407 int s390_set_memory_limit(uint64_t new_limit, uint64_t *hw_limit)
 408 {
 409     if (kvm_enabled()) {
 410         return kvm_s390_set_mem_limit(new_limit, hw_limit);
 411     }
 412     return 0;
 413 }
 414
 415 void s390_set_max_pagesize(uint64_t pagesize, Error **errp)
 416 {
 417     if (kvm_enabled()) {
 418         kvm_s390_set_max_pagesize(pagesize, errp);
 419     }
 420 }
 421
 422 void s390_cmma_reset(void)
 423 {
 424     if (kvm_enabled()) {
 425         kvm_s390_cmma_reset();
 426     }
 427 }
 428
 429 int s390_assign_subch_ioeventfd(EventNotifier *notifier, uint32_t sch_id,
 430                                 int vq, bool assign)
 431 {
 432     if (kvm_enabled()) {
 433         return kvm_s390_assign_subch_ioeventfd(notifier, sch_id, vq, assign);
 434     } else {
 435         return 0;
 436     }
 437 }
 438
 439 void s390_crypto_reset(void)
 440 {
 441     if (kvm_enabled()) {
 442         kvm_s390_crypto_reset();
 443     }
 444 }
 445
 446 void s390_enable_css_support(S390CPU *cpu)
 447 {
 448     if (kvm_enabled()) {
 449         kvm_s390_enable_css_support(cpu);
 450     }
 451 }
 452
 453 void s390_do_cpu_set_diag318(CPUState *cs, run_on_cpu_data arg)
 454 {
 455     if (kvm_enabled()) {
 456         kvm_s390_set_diag318(cs, arg.host_ulong);
 457     }
 458 }
 459 #endif
 460
 461 static gchar *s390_gdb_arch_name(CPUState *cs)
 462 {
 463     return g_strdup("s390:64-bit");
 464 }
 465
 466 static Property s390x_cpu_properties[] = {
 467 #if !defined(CONFIG_USER_ONLY)
 468     DEFINE_PROP_UINT32("core-id", S390CPU, env.core_id, 0),
 469 #endif
 470     DEFINE_PROP_END_OF_LIST()
 471 };
 472
 473 static void s390_cpu_reset_full(DeviceState *dev)
 474 {
 475     CPUState *s = CPU(dev);
 476     return s390_cpu_reset(s, S390_CPU_RESET_CLEAR);
 477 }
 478
 479 #ifndef CONFIG_USER_ONLY
 480 #include "hw/core/sysemu-cpu-ops.h"
 481
 482 static const struct SysemuCPUOps s390_sysemu_ops = {
 483     .get_phys_page_debug = s390_cpu_get_phys_page_debug,
 484     .get_crash_info = s390_cpu_get_crash_info,
 485     .write_elf64_note = s390_cpu_write_elf64_note,
 486     .legacy_vmsd = &vmstate_s390_cpu,
 487 };
 488 #endif
 489
 490 #ifdef CONFIG_TCG
 491 #include "hw/core/tcg-cpu-ops.h"
 492
 493 static const struct TCGCPUOps s390_tcg_ops = {
 494     .initialize = s390x_translate_init,
 495     .tlb_fill = s390_cpu_tlb_fill,
 496
 497 #if !defined(CONFIG_USER_ONLY)
 498     .cpu_exec_interrupt = s390_cpu_exec_interrupt,
 499     .do_interrupt = s390_cpu_do_interrupt,
 500     .debug_excp_handler = s390x_cpu_debug_excp_handler,
 501     .do_unaligned_access = s390x_cpu_do_unaligned_access,
 502 #endif /* !CONFIG_USER_ONLY */
 503 };
 504 #endif /* CONFIG_TCG */
 505
 506 static void s390_cpu_class_init(ObjectClass *oc, void *data)
 507 {
 508     S390CPUClass *scc = S390_CPU_CLASS(oc);
 509     CPUClass *cc = CPU_CLASS(scc);
 510     DeviceClass *dc = DEVICE_CLASS(oc);
 511
 512     device_class_set_parent_realize(dc, s390_cpu_realizefn,
 513                                     &scc->parent_realize);
 514     device_class_set_props(dc, s390x_cpu_properties);
 515     dc->user_creatable = true;
 516
 517     device_class_set_parent_reset(dc, s390_cpu_reset_full, &scc->parent_reset);
 518 #if !defined(CONFIG_USER_ONLY)
 519     scc->load_normal = s390_cpu_load_normal;
 520 #endif
 521     scc->reset = s390_cpu_reset;
 522     cc->class_by_name = s390_cpu_class_by_name,
 523     cc->has_work = s390_cpu_has_work;
 524     cc->dump_state = s390_cpu_dump_state;
 525     cc->set_pc = s390_cpu_set_pc;
 526     cc->gdb_read_register = s390_cpu_gdb_read_register;
 527     cc->gdb_write_register = s390_cpu_gdb_write_register;
 528 #ifndef CONFIG_USER_ONLY
 529     cc->sysemu_ops = &s390_sysemu_ops;
 530 #endif
 531     cc->disas_set_info = s390_cpu_disas_set_info;
 532     cc->gdb_num_core_regs = S390_NUM_CORE_REGS;
 533     cc->gdb_core_xml_file = "s390x-core64.xml";
 534     cc->gdb_arch_name = s390_gdb_arch_name;
 535
 536     s390_cpu_model_class_register_props(oc);
 537
 538 #ifdef CONFIG_TCG
 539     cc->tcg_ops = &s390_tcg_ops;
 540 #endif /* CONFIG_TCG */
 541 }
 542
 543 static const TypeInfo s390_cpu_type_info = {
 544     .name = TYPE_S390_CPU,
 545     .parent = TYPE_CPU,
 546     .instance_size = sizeof(S390CPU),
 547     .instance_align = __alignof__(S390CPU),
 548     .instance_init = s390_cpu_initfn,
 549     .instance_finalize = s390_cpu_finalize,
 550     .abstract = true,
 551     .class_size = sizeof(S390CPUClass),
 552     .class_init = s390_cpu_class_init,
 553 };
 554
 555 static void s390_cpu_register_types(void)
 556 {
 557     type_register_static(&s390_cpu_type_info);
 558 }
 559
 560 type_init(s390_cpu_register_types)